Viral haemorrhagic septicemia and infectious hematopoietic necrosis

Viral haemorrhagic septicemia (VHS) and infectious hematopoietic necrosis (IHN) are virus diseases causing heavy losses in salmonids. Norway currently has a free status for both diseases.

Both diseases are due to infection with Novirhabdovirus and are listed nationally and internationally. The VHS virus is also detected in several marine species including lumpfish and wrasse.

The purpose of the surveillance program is to document the free status for VHS and IHN in salmon and rainbow trout in Norway.

2021

This surveillance programme has a risk-based approach. The core surveillance activity is the routine clinical inspections on marine sites with farmed salmonids and analyses of samples collected from diseased fish. In 2021, samples from pink salmon caught in several rivers as well as rainbow trout and brown trout from freshwater sites were also included. Viral haemorrhagic septicaemia virus and infectious haematopoietic necrosis virus were not detected in any of the samples tested in the 2021.

Download report

Previous reports